Impression tray



Patented 17, 1,928.

"fir u' rMPREssIoNTRAY.

My Ainvention 2 relates "to impression trays of the/natiireV-used vin dental vwork for procuring impressions of individualJ teetlniandy L has for Aan objectithereofto provide-a defais vice adapted to supportimpressi oni material and'ormV impressions in sections, whereby tooth-'models mayV be laccurately constructed held whiler zin-impression is bein-g formed and wh-ith urther serves `as a parting f plate for causingE the' tooth impressions to "separate alon-githe:desiredisiirface. Y

A stillfui'fther object of the inventionr re-v si'cles in constructing' the impression .trayf of sheet: metal,- the saine' being formed with .an

l oocliisal'wallhavingfalingual wall bent from v hintdfth-e same'fto resist V-iinternalxforces' of one :sifdey thereof, said: flange being .benti from tliefoth'er sizde'of-gsaidroeclusalwall, and in further" forming said `tray, with a proximal wllbent from fsaid `lingual 'Jwall.

' .JA stillffurther object `,ofthe invention 4residesiin formingan angular projection on thelend of said proximal wall, whiohangular projecti'on is .adapted tor be engaged by an earfformed on saitbiiange vand lodgedzbethe impression materiali within i the tray whentbeimpressionis beingforined. i

.fAn/otherfobjeet of the invention resides.

inarranging said vkangular,projection sol that ythe lsame 'providesza protruberance on the surface of saidfangezto-supply ak guide 4for repositioning tithe complemental Lvtootli imression after removal `from i the "specimen, @With the foregoing and .1 vother f obj eets in vie-w, which "will-sappear inthe i'following description, V,theV `invention 'resides' the f ingitheapplication ,the4 i-inpression'tray'.

.novelfcombination and L-arrangement ff parts and L in f the `details of construction ihereinf afterl described andelaimed. i f e lFig. :l isl-aperspeetive IView ofmyimprovediinpression tray. i

tray :shown inFig. l. v

' ylilig-" islan end elevational view of the structure shown in lfligs.. 1 v -ai-id 2; '.Fig. i4=isa=fragmentary-side elevational l view of Van lupper i 'human Lma'xilla: illustifatf Y ofmy-improvedimpresfv sion 'trayfthereto fFigl 5 ishayviewsimilar to; Figiliiishowing the comp-lemental impression; mounted :upon

l eFig. 6 is 2 an 1- obverse elevational Lv-iew :of

therein removed from the specimen.

de` the fimpression' j tray with litsgimpression complemental 'impression illustratedv in" Figxa H `:v

11n the'formation'of tootbmodelscorpplaster-casts thereof lfor fthe "Purpose of 0021.17'

vstructing clasps :and `other appliances re-y quiring ac'curacyior theaadaptation V.of the same to the teeth,y considerable :diheulty r:alias lieretoforef beenj encounteredi'in:the :eonstriuc-V` tion @issueh models, due Vto fthe fact vthat l where malformations, under-outs, fandiother irregularities .are ipresenti the l impressioni@ an not: ,befvwith'drawn "from :the specimens withf out 'extensive mutilation. Where hinged trays havefbeen usedzfor'tlie purposathe. f I removal :of .the E'sections sof a-tlie impression Y from'the specimenv has necessarily been.,V coninedtov the movement'cof the tray -zlia'lfvesv about their pivotss-whicha in: certain instances pression from; the" specimen without distortion.'y iAt the samer time such devices require y -a foertain yspeeies I of. impression 'eompound a'daptedfto be lsplit in order to-'removeT-the impression, thereby requiring additional skill and care in the splittingl of the same. Su'ch impressionxtnaysfearez inorei orI'lesszdifiiicult tov hand-leqfand doinotr allow thegpaeking v andziapplicationwof theA impressioni'compound as'. y

wouldinot permitff the removal (of :the aim-i y into the proximal spaces as readily as should be, thereby frequently producing impressions with imperfections and other blemishes. My invention overcomes these difficulties by providing a simple and effective impression tray which may be used with any species of impression compound now available for. the purpose, andlwhich permits of packing the impression compound within the proximal space to forma perfect impression, which device is simple and convenient to handle and at the same time providesa guide for the replacement of the complemental impression, after the same 'has been removed from the specimen. Y

My invention is for the purpose of forming impressions of single teethand particularly where adjacent teeth are missing or have been extracted, and for thepurpose of illustrating the application of my invention to the human teeth, lY have illustrated in Figs. and 6 a portion of a human maxillaV A in which the incisors and 11, the cuspid 12 and the two bi-cuspids 13 and 14 are shown, the molars having been previously extracted. Although it can readily-be comprehended thatthe invention may be used for forming impressions in a multiplicity of instances, yet its application to the particular specimen illustrated will suffice to show the application and utility of the device.

My improved impression tray is best illustratedin Figs.- 1, 2 and 3 and is preferably formed of ,sheet metal bent into the formation illustrated. This impression tray comprises a body `portion B which consists of an occlusal wall 15 of rectangular formation having bent up from one side thereof a lingual wall 16. From the other side of said occlusal wall is bent out a flange 17 which extends in opposite direction to the lingual wall16 and is substantially parallel thereto. From the end 18 of the lingual wall 16 is bent outwardly therefrom aproximal wall 23 which meets the occlusal wall 15 along a corner 19 and extends outwardly beyond the flange 17. Qn the end of this proximal wall is formed an angular projection 20 which overlies an ear 21 formed on flange 17, said angular projection lying in contact therewith. TVith this construction the Abody B is formed with a pocket 22 bounded by the walls 15, 16 and 23, t-he flange 17 extending outwardly therefrom. This pocket is for the reception of the impression compound and when the same is forced therein the angular projection 20 cooperating with the ear 21 serves to resist the internal force of the impression compound and to stiffen and hold the impression tray intact. n My invention is preferably used as follows: As previously-stated forfthe purpose of illust-rating the application of my invention to a tooth specimen, l have shown the means? maxilla A as illustrated in Figs. 4 and 5,

and it will be assumed that a model of the,`

pound, indicated at 24, is heated and the pocket of the tray is filled with the same to about two-thirds full and said compound is then allowed to cool slightly.. rlhe compound is next held over an open flame and softened to a depth of about three-sixteenths of an inch and tempered in water at 150o to bring the compound into a suitable condition for receiving the impression of the tooth specimen. vWhere the device is to form an impressionv'of the bicuspid 14 the tray, manipulated through flange 17 as a linger piece, is placed on the lingual surface of said'tooth, with the proximal Wall 23 back of the. cuspid 14, and is pressed toward the teeth until the same are firmly imbedded within the compound along the lingual surface thereof. The impression 'so formed is next chilled after which'the same may be ren'loved lingually from the teeth specimens without fracturing or mutilating the impression. r1`he specimen is next trimmed back with a sharp knife or other suitable tool to the greatest mesio-distal diameter on the lingual side, and the surface of the imiression coated with a thin-film ofV vaseline or other parting substance. After replacing the impression Vupon the tooth specimenas appears in Fig. 4,y the complemental impression is formed by taking a roll of partly softened compound 25,approximately threefourths of anA inch long, the size of the little linger, and heating one side over the flame. rlhe same is then tempered in water at 150, after which said compound is firmly pressed upon the labial or buccal surface of the teeth asthe case maybe, with a portion thereof overlying the flange 17 and particulai-ly the angular. projection I2() formed` on the end of the proximal wall 23, as shown in Fig. 5. At the same time the impression mounted within the pocket 22 of the impression tray is firmly held in` place by means of the fore. finger of one hand and until'the proximal spaces along the labial or buccal surfaces ofthe teeth have been completely vfilled with the compounds. `The con'iplemental impression is now chilled and both impressions removed, the same appearing as illustrated in Figs. 6 and 7. rThe two impressionsare next re-assembled outside of the mouth and the unnecessary edges of the complemental impression trimmed away and thel two impressions cemented together with wax or any other suitable substance. By means of the angular projection 20 the two. impressions may be readily assembled inproper relation to one another, said angular projection serving as a guide for 11e-positioning the complementalimpression upon the flange 17 and the impression ther impressionato,if-separate 'fand for vholding ethe, `san-1e i proper 1 position. when.: re-assembled. The impression so formedqisenext #flowed withiinve'stment, r-kry'ptex., :lowfz'fus- Y ing metal, or any .other'suitablecastingzcomeA Y pound, and the cast allowed-toset' or cool vns 'models of single teeth, and which is par-V as fthefcasefmay doe. `rWhen the model isy hard, 4a knife blademay be vslipped under the tray and the tray snapped 0E. The impression compound mayvnext be softened and removed in the customary manner leaving a cleanfand perfect model of the tooth specimens which will be an exact reproduc tion of the original specimen embodying all the irregularities, malformations, and undercuts present in the same. My invention is highly meritorious in that it provides a simple and eHe'ctive impression' tray whch may be readily and conveniently used in conjunction -with the forming Vof ticularly adapted to be used where adjacent teeth h'ave'been extracted. The device is' easily and readily4 applied and through the agency of the angular projection formed onV the proximal wall thereof serves to provide al guide -for re-assembling the complemental f l pressions being free from one another 'per-V InitV the same of being withdrawn from the specimen in differing directions so that extremely irregular models may be readily formed. The device is extremely simple in construction andy can be manufactured at al nominal cost. By means of the an ular projection and the ear formed on the ange co-operating therewith a rigid and substan-l tial construction is providedV adapted to i withstand the internal strains caused by thel pressing ofthe impression compoundagainst the tooth specimens. v tion further serves as a guide for enabling pression sections for the purpose of pouring or vflowing the casting compound into the mold.' The flange formed on the body portion of my improved impression tray besides serving as a parting surface also. provides r.aconvenient handle for holding and mav nipulating the device while the same is being used. Thetray as shown, is designed to be used for upper lefts and lower rights, although it can readily be comprehended that the impression tray can be constructed both left hand and right hand so that the same `may be used for upper rights and lower lefts, as well.

The. angular proj ecf .theizserves-.as a partinggplate vforfzoa'using ,tion,fas; herein-disclosed,'rfmay.heima'defwith# inithe-L seopezof what` isaclaiimed withoutzgde,l

fpartingffrom the: spiritfoflfmy invention. i f-:Having i described :g-n'iyV invention,v vifvvhat ,claim-:as 'new ziand` desire to zp'rotect `by Letters Patentflis:l -m

,i :1l-.fl Animpression trayscomi-prisin-g'Larzbodyy ,portion l havingfa l lingual wall, pan iocclusal y wall and `a `proximal wall, aflange issuing outwardly from said occlusal wall-substam muy pagina to Said lingua wan andextending in the opposite direction therefrom,

Vocclusal wall, a lingual wall bent from yone side of said occlusal Wall, a flange bent from the other side of saidocclusal wall extending in a direction-opposite to ythat.' of saidlingualwall, a proximal wall'bent from one v endof said lingual vwall,"an angularv projection formed on `theend of saidrproximal wall and an e'aron saidflange (2o-operating withv saidproje'ction for resisting internal pressure. `1 f 3. An impression tray formedv of sheet metalcomprising a body portion having anj occlusal wall, a lingual wall bent from one side'of said "occlusal Wall, a flange bent from j i the otherside of said occlusal-wall extending in the opposite direction. to said lingual wall, a proximal wall bent from one end of said lingual wall'under'the occlusal wall, the free margin offsaid proximaljvvall being bent vback to provide an angular projection, and y an ear on said flange interlocked with saidjl v projection. Y l

y Ll. An impression trayV comprisinga body portion lhaving a lingual wall,an occlusal.` 'wall and a proximal Wall, a flange formed on said'occlusal Wall substantially parallel to said lingual wall extending in the oppoentirety without said body. portion, said flange extending the entirewidth of said oc-v clusal'wall and providing a parting` surface j j and handle for manipulating lthe tray. the operator to readily re-assemble the im- Y V,site direction therefrom and projecting 'in its Q5.3An impression tray .comprisinga bodyA i portion having a lingual wall, an occlusal walland a` proximal wall, a flange formed on said rocclusal wall `substantially parallel to said lingual wall extending in the opposite direction therefromandprojecting in its entirety without said'body portion, said flange extending thel entire width of said occusalwall andhaving'a portion lying in the plane thereof and without'saidvbody portion connected to said proximal wall. i y

6. An impression tray vformed of sheet metal comprising a. body portion having an the other side of said occlusal Wall extending` in the opposite direction to said lingual Wall,

free margin of said proximal Wall being bent hack to provide an angular projection, and an ear on said flange interlocked With said projection, said projection lyingoutwardly from the face of said langeto provide a lug adapted to he impressed in a complemental il impression and serving as a guide in the reassembhng ot said impression after separation thereof and removal of the same from ROLLAND R. JoNEsQ 

